Oddly enough, they are not true jellies because true jellyfish are Medusa jellyfish and are weak swimmers relying only on the currents to move them. Like all jellyfish, Turritopsis dohrnii begins life as a larva, called a planula, which develops from a fertilized egg.A planula swims at first, then settles on the sea floor and grows into a cylindrical colony of polyps. Jellyfish come in a wide variety of shapes and sizes. The largest is the lion's mane jellyfish (Cyanea capillata), which can have a bell over six and a half feet in diameter and weigh up to 440 pounds; the smallest is the Irukandji jellyfish, several species of dangerous jellyfishes found in tropical waters, which measure only about two-tenths of an inch and weigh well under a tenth of an ounce. This ctenophore is native to the east coast of North and South America. They can travel up to 7.5 miles per hour in the water so they do have some defense against predators. Phylum: Cnidaria Class: Scyphozoa Classification: Invertebrate IUCN status: Not evaluated Lifespan (in wild): One year Weight: Up to 2kg Body size: 2cm to 2m Top speed: 8km/h Diet: Fish, shrimp, crabs, tiny plants and even other species of jellyfish Habitat: Oceans The Chironex fleckeri’s movement in its natural habitat is likely to be influenced by the physical factors such as water currents, time of day, tidal state, and local weather conditions.The Australian box jellyfish gets irritated by the rapid wave movements (turbulence) which are caused by the wind speed. Fast jellyfish facts. Groups of jellyfish can contain over 100,000 of them. These jellies can MOVE on their own. A group of jellyfish can be referred to as a bloom, smack or swarm. In a jellyfish aquarium their lifespan can reach in excess of three years if properly cared for. Invasive Species & Fisheries. In 1982, it was discovered in the Black Sea, where it was transported in ballast water. A jellyfish uses its mouth to eat food, discard waste and squirt out water to propel itself. The immortal jellyfish (Turritopsis dohrnii) is estimated to be immortal and have an … These ultimately spawn free-swimming, genetically identical medusae—the animals we recognize as jellyfish—which grow to adulthood in a matter of weeks. The name jellyfish, in use since 1796, has traditionally been applied to medusae and all similar animals including the comb jellies (ctenophores, another phylum). Names. Almost all jellyfish inhabit only the marine waters of the world, there is one species of jellyfish which has its habitat in fresh waters. Speed! In the wild, a moon jellies lifespan is held captive by the dictates of nature. It subsequently spread to the Caspian Sea. Join us as we travel the oceans far and wide with these electric jellyfish facts!. Jelly Fish’ Habitat and Distribution. Ocean sprawl provides more and better habitat for jellyfish to reproduce and complete their lifecycles. They are pelagic animals, that is, they live in the open sea, and although they can be propelled with rhythmic movements of their umbrellas, they move basically at the mercy of the sea´s currents. Did you know that they also have another defense? Jelly like substance makes up most of its jellyfish body.They are beautiful creatures found in water that have been a subject of fascination for a lot of people. The jellyfish are inhabitants of the tropical seas and the Arctic´s cold waters, where they have been for more than 650 million years.. Jellyfish seem to blend in with their environment, undulating gently with the ocean's currents, and with good reason: Their bodies are made up of as much as 98% water. That is why C. fleckeri make homes in offshore waters, estuary systems, and sheltered bays. Jellyfish are bell shaped or umbrella shaped creatures that have adapted themselves very well for a life in water. 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